Our mouthpieces fit most Peak Flow Meters and Spirometers without requiring an adapter. Call for a free sample!  Adult OD 1.188"  Please call for higher quantity pricing: 1-800-843-6226.

Our disposable mouthpieces fit the following peak flow meters and spirometers without requiring and adapter:
Mini Wright PFM-standard and low-range, MicroPeak PFM, Pocket PFM, Assess PFM, Truzone PFM, Koko PFM and Spirometers, Spiro-Flow PFM, Circadian Model 29-7000, AsmaPLAN PFM and Spirometers, Breon adult PFM, PS600/VS400/PB900L, Keystone Pulmok-Screen